Time–frequency localisation of intermittent dynamics in a bistable turbulent swirl flame
Autor: | Zhiyao Yin, Michael Stöhr |
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Rok vydání: | 2019 |
Předmět: |
Physics
Bistability Turbulence 020209 energy Mechanical Engineering 02 engineering and technology Mechanics turbulent reacting flow Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Vortex swirl flame Physics::Fluid Dynamics computational methods Amplitude Mechanics of Materials Harmonics 0103 physical sciences 0202 electrical engineering electronic engineering information engineering intermittent dynamics Verbrennungsdiagnostik Coherence (physics) Spectral purity Backflow |
Zdroj: | Journal of Fluid Mechanics. 882 |
ISSN: | 1469-7645 0022-1120 |
Popis: | This work examines the complex flow field in a bistable turbulent swirl flame, where the flame alternates irregularly between a lifted-off M-shape and an attached V-shape. The flow field consists of various types of intermittent dynamics due to flame-shape switching that occur on different time scales. In order to properly identify, separate and temporally resolve these dynamic components, a novel method of multiresolution proper orthogonal decomposition (MRPOD) is developed by interfacing the maximum overlap discrete wavelet packet transform (MODWPT) of multidimensional data series with the conventional snapshot POD. Specific care is taken to select the wavelet filter, decomposition level and reconstruction bandwidth to achieve variable spectral bandpasses and adequate temporal resolutions. When applied to data series from high-speed three-component velocity field measurements in the bistable swirl flame, MRPOD is capable of isolating frequency components that are usually lumped into a single POD mode, with enhanced spatial/temporal coherence for even weak and highly intermittent dynamics. Owing to the improved spectral purity, a series of previously unknown dynamics is uncovered alongside well-characterised instabilities such as the precessing vortex core (PVC) and thermoacoustic (TA) instabilities. In particular, a non-periodic switch mode is found to couple with the previously identified shift mode only during flame-shape transitions, with pronounced modifications on the backflow and near the inlet of the combustor, a region known to influence the growth rate of PVC. TA oscillations are seen to drive repetitive flame reattachment during M–V transitions that eventually settles into a V-flame. But sustained high TA amplitudes alone do not appear to necessarily presage the onset of such a transition. Additional higher-order harmonics of PVC and evidence of TA modulations on PVC dynamics are uncovered, which also exhibit bi-modal behaviours: while maintaining their characteristic frequencies, these instabilities could attain either a single or double helical structure and are only active during either V- or M-flame periods. |
Databáze: | OpenAIRE |
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